Patent US3690102A successfully refreshed from Google Patents.
US3690102A
Expired / Lapsed
US
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Ejector ram jet engine
Assignee: Individual
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Filing: 1970-10-29
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Granted: 1972-09-12
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Expires: 1990-10-29
Abstract
Abstract A hypersonic ram jet engine is provided which may be of the hydrogen fueled type and in which static and acceleration thrusts are provided as inherent features of the engine to accelerate the aircraft to speeds at which the ram jet engine can operate efficiently. The static and acceleration thrust is provided by the ram jet engine itself; this being achieved by injecting a secondary airflow into the engine at high pressure by the use of the engine''s liquid hydrogen fuel to condense secondary air, as will be described.
Inventors
- 👤 Anthony A Du Pont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:40
CPC Classifications
F; F02; F02K; F02K7/00; F02K7/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
In a ram jet engine which includes a housing defining a primary air inlet and diffuser, a combustion chamber and a discharge nozzle; and which includes fuel injection nozzle means for injecting fuel into said combustion chamber, the combination of: means defining a secondary air inlet and diffuser for receiving a secondary air flow, air injection nozzle means positioned in said primary air inlet and diffuser, a condenser positioned in said secondary air inlet for receiving the secondary air and for liquifying the secondary air, and pump means for pumping the liquid air from said condenser to said air injection nozzle means to be expanded into said primary air inlet and diffuser through said air injection nozzle means.
Claim 2
Dependent Claim
118 words
In a ram jet engine which includes a housing defining a primary air inlet and diffuser, a combustion chamber and a discharge nozzle; and which includes fuel injection nozzle means for injecting fuel into said combustion chamber, the combination of: means defining a secondary air inlet and diffuser for receiving a secondary air flow, air injection nozzle means positioned in said primary air inlet and diffuser, a condenser positioned in said secondary air inlet for receiving the secondary air and for liquifying the secondary air, and pump means for pumping the liquid air from said condenser to said air injection nozzle means to be expanded into said primary air inlet and diffuser through said air injection nozzle means.
Claim 3
Dependent Claim
75 words
The combination defined in claim 1, and which includes heat exchanger means, means directing the secondary air flow from said secondary air inlet through said heat exchanger means to cool the secondary air flow as it is introduced to said condenser, and means directing the liquid air from said pump through said heat exchanger means to cause said liquid air to change to high pressure gaseous air as it reaches said air injection nozzle means.
Claim 4
Dependent Claim
42 words
The combination defined in claim 2, in which said ram jet engine uses liquid hydrogen fuel, and which includes means for directing the liquid hydrogen fuel through said condenser to cause the air leaving said condenser to assume an essentially liquid state.
References Cited (Backward Citations)
US2735263A
Cited
US2948112A
Cited
US3040520A
Cited
US2883829A
Cited
US3237400A
Cited
US3172253A
Cited
US3561217A
Cited
US3261571A
Cited
US3379187A
Cited
US3525474A
Cited
US3557557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |